Explosive arrow, multiple projectiles

Does the explosion lose of its damage or only the on hit dmg?
(i deal only elemental dmg, my tooltip dps is 20)

I have an additional arrow quiver so if multiple projectiles weaken it's fire dmg then i may not use them, also managing mana would be a lot easier.

But if it only applies to on hit dmg then i keep using it since its easier to hit targets if i shot to more direction.

multiple projectiles say: "less projectile damage"
initial hit deals: projectile attack damage (attack damage type)
explosion deals: projectile fire AoE damage (secondary damage type)

Unless there is a new way to build for EA since I've played one, you don't really want to shoot multiple projectiles since you want them to stack on the same target for a bigger boom, which is easier to do if you shoot just 1 in a straight line instead of the cone effect of LMP/GMP and even the split from additional arrow mods (which does not reduce the damage of each shot on its own, it just adds an arrow). Plus as Ludvator mentioned, the explosion damage will be reduced by LMP.

if you only use a quiver corrupted with +1 arrow and not lmp/gmp gem you have no damage loss compared to not using that quiver. only the gems lesser/greater multiple projectiles linked in you EA setup have the xx%less damage mod on them which would lower your damage from EA.

Thanks for the answers,i think i wont use gmp/lmp with EA from now :)

Btw the arrow i get from quiver allows me to get max fuse by 3 shot on larger targets (since that 2 arrow is almost in the middle)

I only used multi projectiles because i use concentrated effect and then the explosion range is a bit lower, so could cause explosion everywhere in a pack.